Promaz Automotive

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Mazda RX-8 turbo ~ Rotary 13B-RE

A few weeks ago we showed you a wild 20B powered Mazda RX-8 street car built by Promaz Automotive. Well here’s another late model Mazda using and older style rotary engine this time in the way of a 13B twin rotor Cosmo engine. The RE engine as found in the JC Cosmo is similar to that of the Series 6 RX-7 but features larger secondary ports.

Fitting the engine is a Promaz bolt-in cross member while the engine itself has been freshened to a turbo bridge port specification. The factory twin sequential turbochargers have made way for a single Garrett roller bearing unit mounted on a custom manifold with boost governed via a Turbosmart wastegate. A switch to E85 pump fuel has enabled an increase in boost, but as the stock RX8 gearbox is still in place the guys have opted to a more forgiving organic single plate clutch.